Officials said the incident had occured a few days back when a security guard of the Parliament Duty Group (PDG) contingent of the paramilitary force allegedly fired the bullets when he was putting his weapon in the armoury.
They said the incident that happened inside the sensitive building zone was a case of "accidental firing" and no one was hit.
"We are conducting an inquiry into the incident. The Parliament complex is a sensitive place from security point of view and there is no place for error here and hence the trooper involved and his supervisor has been removed from security duties of the building," Central Reserve Police Force Inspector General (Operations) Zulfiquar Hasan said.
Officials said the firing, in which at least four bullets were fired, occured when the trooper was alone near the armoury and was about to surrender his weapon as he was getting off from duty.
CRPF has created a special unit called PDG for guarding the complex and this unit draws some of the best jawans and officers from the force.
"This incident was surely a case of accidental firing but it is not being taken lightly and measures will be put in place so that such an incident does not occur again," a senior officer involved in Parliament security duty said.
Parliament is set to hold its winter session from November 24.

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